Los Angeles: Five original stars of hit comedy `The Big Bang Theory` have not yet signed their new contracts.

Jim Parsons, Johnny Galecki, Kaley Cuoco, Simon Helberg and Kunal Nayyar still have no deals to return to the show, two weeks before the scheduled start date for the production on season 8 on July 30, suggest reports.

The two sides are still far apart and there has been no movement in the negotiations, which began in September last year.

The five actors seek hefty pay raises after their co-stars Mayim Bialik and Melissa Rauch inked new deals that gave them substantial salary increases.

Back in September, it was reported that Parsons, Galecki and Cuoco would negotiate together and asked for up to USD 1 million an episode from their current salary of USD 325,000 per episode.
Helberg and Nayyar also negotiated together.